P-46 IMMUNOSUPPRESSION IN POST LIVER TRANSPLANTATION: REVIEW OF THE EXPERIENCE IN A CHILEAN UNIVERSITY HOSPITAL

No Liver transplantation is currently a cost-effective therapy for the treatment of advanced liver diseases. Immunosuppression plays a key role in the prevention of organ rejection. Corticosteroids and anti-CD-25 antibodies are used in the induction phase, while calcineurin inhibitors, mycophenolate, corticosteroids and mTOR inhibitors are used in the maintenance phase. Objectives: To describe the type of immunosuppression regimen used in the management of liver transplant patients during the first post-transplant year. Observational, retrospective cohort study of adult patients undergoing liver transplantation at the Hospital Clínico UC (Santiago, Chile), between January 2020 and June 2023. Demographic and clinical data were included. Immunosuppression regimens used in four periods during the first year of follow-up (at discharge, third, sixth and twelfth month) were evaluated. Pediatric patients, combined transplants and cases with post-transplant follow-up in centers not associated with our hospital were excluded. A total of 160 patients were analyzed, of whom 149 (93.1%) were cirrhotic. The predominant etiology was MASLD (34.3%). The average age was 54 years, with a predominance of females (53.7%). The active immunosuppression regimen at discharge and at the third month of follow-up was the combination of tacrolimus, mycophenolate, and prednisone, representing 68% and 56%, respectively. The dual tacrolimus-mycophenolate mofetil regimen was the most prevalent at month 6 (26%), while at one year of follow-up, tacrolimus monotherapy was the most commonly used (27%). Only 34% of cases were able to maintain monotherapy at one year after transplant (43 pacients with tacrolimus, 6 with cyclosporine and 6 with everolimus). Tacrolimus is the most frequently used immunosuppressant in the maintenance phase. The use of mycofenate mofetil and prednisone decreases as time progresses post-transplant. Only one third of cases achieved monotherapy at one year of follow-up.